Dynamics of impinging nanoscale jets

We use molecular dynamics simulations to describe the collision of two opposed liquid argon nanojets and examine the subsequent stagnation flow. The streamwise and transverse velocity profiles in the proximity of stagnation point are in agreement with macroscale continuum relations u∗ = αx∗, v∗ = −αy∗ for impinging laminar streams. Jet exit velocities are highest for non-wetting surfaces and decrease as solid–liquid interactions are enhanced. The work done to produce the nanojet dissipates at jet exits, increasing the local temperature. The fluid temperature is lowered through cooling as jets exit through the nonperiodic boundaries. In comparison, water nanojets have higher exit velocities with relatively lower pressure drops across the reservoir and cavity.